Improvement in leather-rolling machines



12Sheets--Sheetl S. R. KRM.

Leather-Rolling Machines. N0.15',9`89. Patented June6,18 74.

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UNITED STATES PATENT FFICE.

STEPHEN It. KROM, OF NEW YORK, N. Y.

I MPROVEMENT IN LEATHER-ROLLING MACHINES.

Specilication forming part of Letters Patent No. 151,989, dated June 16, 1874; application filed September 16, 1873.

To all whom it may concern:

Be it known that I, STEPHEN It. KRoM/'of New York city, in the State of New York, have invented a certain Improvement relating to Leather-Rolling Machines, of which the following is a specification:

My improved machine avoids the necessity for cutting through the oors of buildings in order to introduce an efficient carrier for the roller. My machine acts as forcibly arid etfciently on the leather as the best of the previously-known machines. I mount the acting roller on a sector of a wheel, of such size as may operate between the table and the overhead timbers in a room of ordinary height. I cause this sector to vroll on a plane surface xed on the strong' cross-timbers above, holding up the whole etticiently, so that the lowering of the table at intervals by acting on or releasing a treadle, as usual, will increase or relax the force ofthe contact of the acting roller upon the leather.

The rollowing is a description of what I consider the best means of carrying out the invent-ion.

The accompanying drawings form a part of this specification.

Figure l is a side elevation, representing one form in which the invention may be developed. Fig. 2 is a corresponding view ot` another modification.

Similar letters of reference indicate correspending parts where they occur.

Avis a rigid frame-work of timber; l5, a spring-table, and B' a bearing block mounted thereon, on which the leather is placed and shifted in position from time to time under the action ot' the roller. There is an ordinary provision, as represented, by means of a treadle and toggle-levers for raising and lowering the table B B to a small extent at will. The framing A should be braced so as to give it as much rigidityr as possible. The acting roller is marked l), and may be of the ordinaryform and proportions. Its axis is mounted in the center of a stout sector, C, which may be of cast-iron, Aand be nished with a perfectly-cylindricalsurfaceabove, adapted torollsmoothly on a plane surface formed on the lower face of the upper bearing-piece E, which latter is bolted to the overhead timbers, as represented.

Motion is communicated to the sector C, and

thus to the wheel D, by means of the connecting-rod H,wl1ich extends from a pin, m, on the sector C, to a crank-pin, I', on the iiy- Wheel I, which latter is turned by a drivingshaft, c', through a belt from a steam-engine, or by other suitable means. The pivot m, by which the connecting-rod H takes hold of the sector C, should be in or near the center of gyration of the mass, so that the rapid revolution of the wheel I, and the conse-quent rapid reciprocating traverse of the roller D, will induce no serious tendency to disturb the posit-ion of the parts at the top.

However accurately the location of the point m may be determined, it is important to provide means both for maintaining the rollingsurface of the sector G in its proper position under the llat bearing-piece E, and for holding up the sect-or C and its connections when the table B B is lowered, to introduce or remove or change the position of the leather in the course of the treatment. The means provided for this purpose in the two figures are different.

In the form shown in Fig. l, I connect two sets of rods to centers properly located on the moving and fixed parts, so that, as the'sector C rolls on the flat surface E, the rods vibrate in vertical planes. The rod X connects between a center, El, on the Xed part E, and a center, C', on the rolling sector C. There are two of these rods, one on the farther side of the machine, which cannot be represented in this ligure. Just outside of this pair, on the front and back side of the machine, is another rod, Y, connecting between the center E2 and the center C2. Each rod Y is made in two pieces, connected irmly and adjustably together by the long nut y. The centers ot' the bolts or pivots G1 C2 lie exactly in the cylindrical surface ot the sector O. The axes of the bolts or pivots El E2 are carried on stout arms extending outward beyond the ends proper ofthe bearingpiece E, and are fixed at a considerable height above the extended plane of the lower face thereof. This arrangement and proportioning of the parts compels the axes described by the ends of the rods X and Y to coincide so nearly with the cycloidal motion of the pivots C1 CZ as to allow the machine to work smoothly and easily, while the lengths of the rods are so accurately adjusted that When the table B B is lowered and the leather is removed, the upper surface of the sector C will not sink much away from contact with the bearing-piece E. I preter in adj nstin g the machine to tighten the rods Y until the sector C, when unsupported, sinks away about a thirty-second of an inch from its track or bearing-block E. The nuts y should be sufliciently long,` to take hold very firmly of the respective parts ofthe rod Y. They may be provided with right and left threads, or the two nuts may each have righthand threads with diierent pitches. The lattcr allows a more delicate adjustment.

It will be observed that the centers O1 C2 are nearer than the centers El E2. In practice I have given those parts the following,` proportions:

In the modification shown in Fig. 2 there is a toothed segment mounted on one side of the sector C, and a corresponding` rack is formed on the corresponding side of the bearin g-block E. The teeth playing,` into each other keep the sector G in position laterally, while a spring,

P, mounted above and connected by a link, 19,.,

sustains the weight of the parts when the table is lowered.

I claim as my inventionl. In combination with the adjustable table B B', the sector C rocking on the stationary track E, so as to operate the leather roller D, as herein specified.

' 2. The rods Y with adjusting means y, and the rods X arranged relatively to each other and to the sector C and its operating means, and to the rolle-r D and the table below, as and for the purposes herein set forth.

In testimony whereof I have hereunto set my hand this 16th day of November, 1872, in the presence of two subscribing witnesses.

S. R. KROM.

tnesscsz ARNOLD IIRMANN, XVM. G. DEY. 

